Dear Carsten,

I think this bug has been there for quite some time as it is also in
4.67c.

To reproduce:
   o  Open the attached file and set it in org-mode
   o  Go to "* Heading 1" and issue 'C-x n s'
   o  Move cursor to subtree: "** Item 2"
   o  M-x org-shiftmetaup

Then item 1 and item 2 will be joined like this:

,----
| ** Item 2
|    Go to supermarket and get a printer** Item 1
`----

This happens quite often with narrowing.

It could also happen without narrowing when 'require-final-newline' is
set to nil.

Thanks,
-- 
Leo <sdl.web AT gmail.com>                         (GPG Key: 9283AA3F)